We further explored the relationship of SLC52A2 with different functional immune infiltrating cells, including T cell (general, CD8+, Th1, Th2, Tfh, Th17, Treg, and T cell exhaustion), B cell, monocyte, tumor-assisting macrophages (TAMs), M1 and M2 macrophage, neutrophil, and Dendritic cell. The gene discussed is CD8A; the disease is neoplasm.